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Strangers in a Strange Land: The long journey of a sea lily

The larva emerged from the egg and began drifting in the gentle current. It was a bilaterally symmetrical body that recalled a small chordate, but it wasn't. The ciliated body allowed it to swim to some extent but within a few hours it settled to the sea floor and a remarkable change occurred. It began to develop an odd five-fold symmetry. That placed the organism in the lineage of the phylum echinodermata.
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